"There is absolutely no evidence to support the statement that vaccines are linked to autism in any way whatsoever," Arturo says.

He adds that vaccines have saved millions of children from diseases like polio, measles and meningitis.

And to those anti-vaxxers who say they should be free to make choices about their own children, Arturo points out: "It's also everyone else's child you're putting in danger, because you read some forwarded email."

It's true. In 2015, the country's largest measles outbreak in 20 years was attributed to the anti-vaccine movement, according to Forbes. Other recent outbreaks of mumps, whooping cough and chicken pox may also be linked to anti-vaxxers, according to Time.